Cisco 11503 - CSS Content Services Switch Especificaciones descargar pdf (Pagina 157)

6-11

Cisco Content Services Switch Routing and Bridging Configuration Guide

OL-8241-02

Chapter 6 Configuring the Internet Protocol

Configuring IP Opportunistic Layer 3 Forwarding

To restore the default behavior of the CSS, enter:

(config)# no ip uncond-bridging

Configuring IP Opportunistic Layer 3 Forwarding

The CSS opportunistic Layer 3 forwarding feature allows the CSS to reduce the

number of network device hops for certain packets or flows. The CSS forwards

packets at Layer 3 if the destination MAC address in the Ethernet header is the

CSS MAC address. Use the ip opportunistic command to enable opportunistic

Layer 3 forwarding and allow the CSS to make Layer 3 forwarding decisions even

if the Layer 2 packet destination MAC address does not belong to the CSS.

For example, Figure 6-1 shows a CSS connected to VLAN1 and VLAN2. Each

VLAN has an end station and an uplink to Router1. End stations A and B both

point to Router1 as their default router. When End Station A transmits a packet to

End Station B, it uses its default route to Router1. The packet contains Router1’s

destination MAC address. A traditional Layer 2 device forwards the packet to

Router1, and Router1 forwards the packet to End Station B on VLAN2.

Figure 6-1 Example of Opportunistic Layer 3 Forwarding

End Station A

Subnet

VLAN2

VLAN1

Router1

(default)

End Station B

CSS

Internet

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Cisco 11503 - CSS Content Services Switch Especificaciones Pagina 157